Lock screen orientation

[patrikd]

Hi all,
is there a way to lock the screen to for all mobile devices to portrait mode only by code?
I found a solution for doing that on android with overriding the standard activity and add code
for a jni call. But I also need that on iOS.
I also tried:

QScreen* screen = QGuiApplication::primaryScreen();
    screen->setOrientationUpdateMask(Qt::PortraitOrientation);

QScreen* screen = QGuiApplication::primaryScreen();
    screen->setOrientationUpdateMask(Qt::PortraitOrientation);

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but this seems to have no effect, screen is still rotating.
Any ideas?
Thx,
Patrik